With family controls Fidelity Investments, America's largest mutual fund company. Assets under management: $1.5 trillion. Father Edward III joined company as an analyst in 1957, president 15 years later. "Abby" studied art history at Hobart & William Smith Colleges; then earned Harvard M.B.A. Joined family business 1988, tracked industrial equipment stocks. Ran her first diversified fund 1993. Father reduced his ownership in 1995; Abby inherited a 24% stake. Became president of company's mutual fund division 2001. Now runs Employer Services division, which administers payroll and employee stock plans. Who owns what? Once clearly defined, Fidelity stakes amongst Johnson family members are now one of the best-kept secrets in capitalism. Company says Abby has sold some of her shares to other family members; family still controls 49% of company.

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